Advanced Sub Tab

Use the Advanced sub tab to set the AFC Mode and the front of boat offset.

The available Advanced sub tab settings are:

•AFC Mode—sets how the scanner frequency is adjusted. Select Auto to automatically adjust the scanner frequency for optimal performance (recommended). Select Manual to set the frequency manually.

Basic Operation > Radar Tab

To manually adjust the scanner frequency:

1.Highlight the AFC Mode field, and press ENTER.

2.Select Manual, and press ENTER.

3.Highlight the Freq button to the right of the AFC Mode field, and press ENTER.

NOTE: The Freq button is available only available if Manual is selected in the AFC Mode field.

4.Press up or down on the ROCKER to adjust the scanner frequency.

5.Press ENTER to accept the frequency change.

Note: The Signal Strength bar graph is damped and may be slow when responding to frequency tuning changes.

•Signal Strength—Shows the strength of the radar signal.

•Front of Boat Offset—allows you to offset the front of the boat if you mount the radar at an angle.

GMR 21/41 Owner’s Manual

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